Daniel d



(No Model.)

D. D. MOOK.

GRAIN SCREEN.

N0. 312,'744. Patented Feb. 24, 1885.

[we-20502 I w A. Q: v m m m m m a a Q a a m m m m G 5 m m Q m m m m 3 w :5 Q a mg m V I I I 1 I a: m M; Q W 3 1 1 "1E Q m $5 5 midi W E G U D D Q m kmh mwi h E B 9 Q E E .K. r E n: C C1-.." d Y m w j V Wiwsses;

NrrEo STATES PATENT Fries.

DANIEL D. MOOK, OF NORTH PEMBROKE, NEWV YORK.

GRAIN-SCREEN.

SPECIFICATION forming part of Letters Patent No. 312,7d4, dated February 24, 1885.

Application filed September 10, 1884. (No model.)

fication.

My invention relates to improvements in grain-screens in which perforated metallic plates are used in conjunction with securing devices; and the objects of my invention are,

first, to provide a sieve with two metallic plates in duplicate, with uniform dischargin openings, the holes in each plate being directly over its counterpart for certain conditions and kinds of grain; second, to have one plate permanently secured to the supporting frame, the other movably secured, to afford facilities for varying the mesh or size of the w nings; and, third, to furnish means for Listening the plates in any desired position relative to each other. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a plan or face view of the screen with the full openings. Fig. 2 is a face view of the screen after having both alongitudinal and lateral adjustment given to the movable plate, the fullsized'holes being shown by dotted lines; and Fig. 3 is a view the reverse oi the one shown in Fig. 1.

Similar letters referto similar parts throughout the several views.

Ais a rigid wooden four-sided frame, to which is secured upon every side the perfo rated metallic plateB.

B is a movable plate, the counterpart of plate 13, with the exception of being diamet rically smaller, to allow of adjustment for a purpose hereinafter. explained.

A is a central crossbar, uniting the sides of the frame A. l

b are perforations made in both plates, preferably rectangular in shape and of uniform space. i.

c, entering the cross-bar A, and by means of p which, in connection with the plate D, the entire surface of the perforated plates are held in close juxtaposition,

I do not wish to limit my invention to the use of the above-described means for fastening the plates, as any well-known clamping device may be adopted. It is only necessary to have the movableplate made adjustable so as to diminish or increase the size of theholes through which the impurities pass, and thereby practically provide a single adjustable screen that will perform the work of the nest of sieves ordinarily used. It will be observed that this movable plate is capable of being so adjusted that the openings are made of any required size or shape.

I am aware that previous to my invention metallic sieves having rectangular shaped holes have been used. and I therefore do not claim such a sieve, broadly; but

Vhat I do claim as my invention, and de sire to secure by Letters Patent, is

The combination of the frame A, cross-bar A, perforated plates. B B, and securing-plates E D, all arranged and operating substantially as described.

" DANIEL D. MOOK.

\Vitnesses:

G. V. FORD, E. J. MocKFoRD. 

